Your chick may have Infectious Bronchitis which is very contagious! Make sure to keep it apart from your other chicks! There is no specific treatment for infectious bronchitis, but there are supportive measures you can take to help infected chickens. Antibiotics can control secondary infections...
Hello! Did you use cedar shavings in your brooder? They make it hard for chicks to breath! If so move to pine shavings quick! Try giving it fresh water. I will try to find some more info! 💚